Device properties are stored in the system and read by the driver when it loads, and then the device is programmed according to these loaded values. The properties are protected during read and write access times, and some of them are pre-defined by the configuration dialog box. Different device's functions are influenced by different properties. These properties are represented by an ID code for an application that calls Advantech API functions. An application can use a default value set by the configuration dialog box, or call Advantech API functions: DRV_DeviceGetProperty and DRV_DeviceSetProperty , to modify individual properties in running time.
USB-4704 supports the following properties:
|
Property |
Description |
|
gets the board ID of the device. |
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sets or gets the current pacer rate of the device's AI operation. |
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sets or gets the single-ended or differential of the channel configuration. |
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gets the AO range spec list of current device. |
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sets or gets the current AO range setting of one channel. |
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gets the digital input channel count. |
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gets the digital input port counte. |
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gets the digital output channel count. |
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gets the digital output port count. |
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gets the counter capability. |
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gets the counter channel count. |
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gets the internal clock frequency device used for pulse out. |